[928uk] '90 S4 Auto driver's seat memory function

[Richard Armstrong]

Correct. The memory unit will move one of the motors at a time. The seat 
moving relay box is under the seat and is prone to picking up moisture 
causing all sorts of problems.
I was once driving down the motorway and the seat moved forwards to my 
wife's ridiculous driving prosition. I had to hold the seat switch until 
I pulled over and disconnected the mem unit. about 6 months later I 
re-connected it and it has ben fine ever since
richard

On 10-Jun-19 11:51 AM, Paul Smith wrote:
> I have never owned a 928with memory seats, but I have fiddled with one.
> I don't think that the memory function ever tries to do two things at 
> the same time.
>
> If I were in your position, I would first go through the full range of 
> every movement (seats and mirrors) manually to make sure that the 
> mechanical side is all free and the relays are not shorting power to 
> ground.
> Ideally do this with an ammeter in the power feed so you can see if 
> any motion is drawing more current.
>
> ( I can't see any limit switches on the wiring diagrams, so look 
> especially at the current drawn when a limit is reached but you still 
> hold the switch.)
>
> If that didn't reveal any problems I would try to pin down when it 
> happens.  Is it time related or actions related? Could it just be a 
> small overload (< double the fuse rating) causing the fuse to blow 
> after a time. Is it related to one movement? e.g. set the movements at 
> middle positions, program the memory for that position, then move away 
> from that position and use the memory to return to the middle position 
> (just one movement at a time).
>
> Smiffy
>
> On Mon, 10 Jun 2019 at 10:50, Pete Owen via 928uk 
> <928uk at lists.928.org.uk <mailto:928uk at lists.928.org.uk>> wrote:
>
>
>     Driver's seat motor functions seem to work fine individually but
>     the memory function blows the associated fuse on or close to the
>     very last bit of its cycle.
>
>     Thought here is that it's possibly trying to perform a number of
>     functions at once and overloading.
>
>     Anyone have experience of anything similar or ideas on what's
>     going wrong or how to fix or .... 😀
>
>     P
>

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